We have a couple Cisco IP phones connected behind a remote Cisco 1811 terminating a site to site VPN. Each day, the phones will drop not at the same time usually but a couple times a day. The "band-aid" fix is is reboot the phone. Even when the phone is down for the user, I can still ping them. There is some latency which I thought was attributed to the ISP connection but a direct connect to the Internet does not show latency. Any idea/troubleshooting step to isolate this issue would be appreciated. The phones plug in to a 2950 switch behind the 1811. Typical ping times over the tunnel are 30-50 ms and at times, it gets as high as 200-300 ms and even a timeout here or there. I have been checking the tunnel configuration and it does not appear to be the issue. I have attached the remote 1811 configuration. Thanks.